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fixing several bugs in string.find 

so hard to get anything right the first time!
This commit is contained in:
JeffBezanson 2008-12-24 05:02:58 +00:00
parent 830e1c986c
commit 7e04bb948c
1 changed files with 15 additions and 10 deletions
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25
femtolisp/string.c
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@ -248,15 +248,11 @@ value_t fl_string_find(value_t *args, u_int32_t nargs)
size_t len = cv_len((cvalue_t*)ptr(args[0])); size_t len = cv_len((cvalue_t*)ptr(args[0]));
if (start > len) if (start > len)
bounds_error("string.find", args[0], args[2]); bounds_error("string.find", args[0], args[2]);
char *needle=NULL; size_t needlesz=0; char *needle; size_t needlesz;
if (!iscvalue(args[1])) if (!iscvalue(args[1]))
type_error("string.find", "string", args[1]); type_error("string.find", "string", args[1]);
cvalue_t *cv = (cvalue_t*)ptr(args[1]); cvalue_t *cv = (cvalue_t*)ptr(args[1]);
if (isstring(args[1])) { if (cv_class(cv) == wchartype) {
needlesz = cv_len(cv);
needle = (char*)cv_data(cv);
}
else if (cv_class(cv) == wchartype) {
uint32_t c = *(uint32_t*)cv_data(cv); uint32_t c = *(uint32_t*)cv_data(cv);
if (c <= 0x7f) if (c <= 0x7f)
return mem_find_byte(s, (char)c, start, len); return mem_find_byte(s, (char)c, start, len);
@ -266,14 +262,23 @@ value_t fl_string_find(value_t *args, u_int32_t nargs)
else if (cv_class(cv) == bytetype) { else if (cv_class(cv) == bytetype) {
return mem_find_byte(s, *(char*)cv_data(cv), start, len); return mem_find_byte(s, *(char*)cv_data(cv), start, len);
} }
if (needlesz == 0) else if (isstring(args[1])) {
return fixnum(start); needlesz = cv_len(cv);
needle = (char*)cv_data(cv);
}
else {
type_error("string.find", "string", args[1]);
}
if (needlesz > len-start) if (needlesz > len-start)
return NIL; return NIL;
else if (needlesz == 1)
return mem_find_byte(s, needle[0], start, len);
else if (needlesz == 0)
return size_wrap(start);
size_t i; size_t i;
for(i=start; i < len; i++) { for(i=start; i < len-needlesz+1; i++) {
if (s[i] == needle[0]) { if (s[i] == needle[0]) {
if (!memcmp(&s[i], needle, needlesz)) if (!memcmp(&s[i+1], needle+1, needlesz-1))
return size_wrap(i); return size_wrap(i);
} }
} }